Tool attachment



Oct. 15, 1935.

H. M. HoGE 2,017,247

TOOL ATTACHMENT Filed Oct. 17, 1934 /Et' 6' INVENTOR.

BY MMM/awymm ATTORNEY.

Patented Oct. 15, 1935 UNITED STATES TOOL ATTACHMENT Hugh M. Hodge, Detroit, Mich., assignor of one-half to George A. Vis, Detroit, Mich.

Application October 17, 1934, Serial No. 748,613

10 Claims.

The present invention relates in general to improvements in the art of manufacturing machine tools, and relates more specifically to improved means for removably attaching perforating tools such as punches and dies, to their positioning and supporting members.

Generally defined, an object of the present invention is to provide simple and highly effective instrumentalities for removably securing certain tools such as punches or dies, to their carrier members.

It is of extreme importance in the art of perforating sheet materials with the aid of complementary punches and dies that perfect registry l5 of the coacting tools be maintained at all times,

and that these tools be readily replaceable. Depending upon the shape of perforations desired, the punches frequently assume odd shapes, and regardless of the shape thereof. they must register with the similarly shaped receiving dies with utmost precision. Because of the fact that it is frequently necessary to. change the shape and size of the perforations, it is prerequisite that the perforatiing tools be readily interchangeable with others, while at the same time maintaining rigid attachment of these tools to their supports when in use. The prior tool attachments of this general type, besides being relatively complicated, did not permit convenient application of the tools to their carrier members and subsequent remo-val therefrom and, moreover, did not insure the requisite precision of registry necessary to insure perfect perforating and to eliminate breakage of the cooperating tools.

It is therefore a more specific object ofthe present invention to provide an improved tool attachment which meets all of the above-mentioned desirable requirements, and which eliminates all of the objectionable features of prior attachments of this type.

Another specific object of the invention is to provide an improved fastening means for perforating tools or the like, which may be applied with advantage to tools or dies of various types to provide a readily removable, simple, and rigid attachment. f

A further specific object of the invention is to provide a new and useful fastening' for the punches and dies of perforating machines, which may be readily manufactured and subsequently manipulated, and which utilizes relatively standard attaching elements.'

Still another specific object of the invention is to provide an attachiment wherein a minimum number of relatively simple attaching elements vare utilized to firmly but removably fasten both a tool and its positioning block to a common supporting member for both the tool and block.

A further specific object of the invention is to provide a durable fastening which is readily ap- 5 plicable to perforating presses and machines of different kinds, and which may be furnished at minimum cost.

l These and other objects and advantages will be apparent from the following detailed descrip- 10 tion.

A clear conception of several embodiments of the invention, and of the mode of constructingr and of applying the improved tool attachment to the punches and dies of perforating machines, l5 may be had by referring to the drawing accompanying and forming a part of this specification, in which like reference characters designate the same or similar parts in the various views.`

Fig. l is a part sectional side elevation of a plu- 20 rality of punches showing the same secured With the improved attachments to a, common positioning block and to a fragment of the punch supporting member;

Fig. 2 is a sectional view of a plurality of dies 25 cooperable with the respective punches of Fig. 1, and showing the dies likewise secured with the aid of the improved attachments to a common positioningv block and to a fragment of the die supporting member; 30

Fig. 3 is a sectional view of a single punch attachment embodying the present improvement;

Fig. 4 is a bottom view of the assemblage shown in Fig. 3, a section having been taken thru the punch along the line 4 4; 35

Fig. 5 is a sectional View thru a modiiiedtype of attachment for a perforating punch; and

Fig. 6 is a bottomview of the assemblage shown in Fig. 5.

While the invention has been shown and de- 40 scribed herein as being specifically applied to punches and dies for producing circular perforations, it is not intended to restrict the scope by such specific disclosure since .the improvements are obviously more generally applicable to other 45 types of perforating tools and machine elements. Referring specifically to Fig. l of the drawing,

the four circular punches 'l are of the same general type but of different effective diameters, and these punches 'l are simultaneously cooperable 50 With dies 8 of the type shown in Fig. 2, to punch a series of holes into a sheet of material. Each of the punches 1 has an enlarged polygonal or cylindrical shank portion 9 adapted to snugly engage a. properly located bore or hole I0 in the 55 common positioning block II, and this block II coacts with acombined gage and reaction plate I2 which, in turn, coacts with the main punch supporting member I3.

'Ihe block and plate |2 may be denitely positioned relative to the supporting member I3 by a pair o f end dowels I4, and the positioning block and reaction plate I2 may in some cases be directly attached to the member I3 by one or more ordinary cap screws I5. These cap screws I5 may, however, be dispensed with in favor of one or more punch-attaching cap screws I6, such as shown to the left of Fig. 1, and the vcarrying structure.

Each of the punch-attaching screws I6, I1 is provided with a polygonal or cylindrical head I8 having a central polygonal socket I9 therein for the reception of a manipulating plug wrench, andthe side of each screw head I8 is provided with one or more cut-outs 20. Each of the punch shank portions 8 is provided with Aone or more lateral recesses or cut-out portions forming abutments 2|, and the screw heads- I8 are adapted to coact with these abutments 2| when the punches are locked in place. When the screws I6, I1 are rotated to bring the cut-outs 20 directly adjacent to the corresponding punch shanks, the punches 1 are released and may be freely removed from or inserted within theshank receiving holes I0.

In Fig. 2 of the drawing the same general method of -attachment has been applied to the dies 8. Each of the dies 8 is hollow to accommodate the discharge of stock removed during perforation and has an enlarged polygonal or cylindrical shank portion 22 adapted to snugly nt a properly positioned hole 23 in the common positioning block 24. The) block 24 coacts with a combined gage and reaction plate 25 which, in turn, rests upon a main die supporting member 26, and both the plate 25 'and member 26 are provided with openings which register with the central openings of the dies 8.

'Ihe block 24 and plate 25 `may be definitely located with respect to the supporting member 26 by a pair of dowels I4, and the positioning block 24 and reaction plate 25 may, if desired, be directly attached 'to the member 26 by one or more ordinary cap screws I5. These attaching screws I5 may, however, be dispensed with in lieu of one or. more dic-attaching cap screws I6 of the type shown to theleft of Fig. 2, and

Each of the die attachingscrews I5, |-1 may likewise be provided with a polygonal or cylinydrical head I8 having a central polygonal socket I9 therein for receiving a manipulating plug wrench, and the side of each screw head I8 is provided with one or more lateral cut-outs 26. Each of `the die shank portions 22 is provided with one or more cut-outs forming abutments 21, and the locking screw heads I8 are adapted to coact with these abutments when the dies 8 5 are locked in position. When the screws I6, I1 are rotated to cause the cut-outs 20 to be positioned directly adjacent to the corresponding die Shanks, the dies 8 are released and may be freely withdrawn from or inserted within the die' 10 receiving holes 23.

The punch and die supporting members I3, 26 arel relatively movable during normal operation of the perforating press, to cause the punches 1 to enter and to be subsequently withdrawn from l5 the vcorresponding dies 8. The degree of entry may be varied either by changing the extent of movement of the members I3, 26, or by replacing the gage and reaction plates I2, 25 with others having different thickness. The pin dowels I4 20 definitely position the blocks I I, 24 and the plates I2, 25 relative to the supporting members I3, 26, and the blocks II, 24 definitely position the punches 1 and dies 8 with respect to each other so as to insure perfect registry of the per- 25 forating tools. The attaching screws I6, I1.' while affording a rigid attachment of the punches 1 and dies 8 to their supporting elements during normal use of the press, however, also permit rapid and convenient removal 30 and reinsertion .of the perforating tools with respect to the positioning blocks 24 and plates I2, 25 whenever desired. The cut-outs 20 in the screw heads I8 obviously serve to permit such removal and insertion without necessitat- 35 `ing complete withdrawal of the screws I6, I1,

thereby permitting the use of the screws I6 alone for the purposes of clamping the tools in place and of attaching the positioning blocks II, 24 and plates I2, 25 to the carrier members 40 I3, 26. y

With reference to Figs. 3 and 4, a single punch V1 is shown therein having its shank portion 9 cooperating with a bore I0 in the positioning block 28. This block 28 is cylindrical in form and co- 45 acts with a reaction plate 29 which, in turn, coacts with a supporting member 38. Dowels I4 are `again employed for the purpose of denitely positioning the block 28 and plate 29 relative to the member 20; and the removable attachment 50 of the punch 1 to the block 28, and of the block 28 and plate 29 to the support, is effected by the clamping screws I5 alone. As in the disclosure of Figs. 1 'and Z, the screws I6 of Figs. 3 and 4 are again provided with socketed heads I8 coop- 55 erable with abutments 2| formed on the punch shank, and these screw heads I8 likewise have lateral cut-outs 20 for facilitating insertion and removal of the punch 'I.

In Figs. 5 and 6 is shown a small single punch 60 1 having a modied type of attachmentapplied thereto. The punch 1` has a cylindrical shank portion 8 snugly tting a bore I 0 in a rectangular positioning block 3|, Iand this block coacts with a reaction plate 32 which, in-turn, coacts with the 65 main supporting member 33. The block 3| and reaction plate 32 are properly .positioned relative to the supporting member 33, by means oi. pin dowels' I4; and a single attaching screw 34 coacts with the punch 1, block 3 I, and plate 32 in order to 70 lock these elements to the member 33. The screw 34 has a substantially cylindrical head 35 provided with a transverse manipulating slot 36, and having a side cut-out 31. The screw head 35 is adapted to coact with a shoulder or abutment 2| formed 75 on the shank portion 9 of the die, and when the screw 34 is rotated with the aid of a screw driver applied to the slot 36, so as to position the cutout 31 in line with the side surface of the shank, the punch l may be readily removed from or inserted within the bore I0. 'I'his embodiment of the improvement differs from those previously described merely in the formation of the clamping screw 34, and this screw may assume still different forms without departing from the spirit of the invention.

From the foregoing description, it will be apparent that the present invention provides simple means for firmly but detachably securing a perforating tool such as a punch or a die to its supporting or carrying structure. The same element that is utilized to hold the tool in place may also serve to hold the positioning block and reaction plate against the supporting member, and the tool may be removed without disturbing the block and plate. A single attaching screw may also be utilized to fasten several tools to a common support, and the improved assemblage insures utmost precision in coaction of the punches with the dies. The improved clamping screws may be readily manufactured and applied to any punch or die assemblage at moderate cost and may also be conveniently manipulated for rapid withdrawal of the tools with which they cooperate. It isalso noteworthy that the coaction of the clamping screw with a cut-out or notch in the side of the perforating tool positively prevents the tool from rotating, thereby making the attachment especially applicable to polygonal punches and dies. Another very important feature of the present invention is that the attaching screws for the perforating tools may be extended directly into the main supporting member closely adjacent to the tools, thereby transmitting the stripping forces directly to the main supporting member` and not thru the positioning block and clamping screws located remote from the tools, as in the priorv attaching devices. v

It should be understood that it is not desired to limit the invention to the exact details of construction, and to the precise mode of operation herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent: Y y,

1. A-tool attachment, comprising, a positioning block having a hole therein, a tool having a shank insertible within said hole and provided with an abutment, a supporting member, and clamping means coacting directly with said abutment for` detachably fastening both said tool and said Iblock directly to said member.

2. A tool attachment, comprising, a positioning block having a' bore, a tool having a cylindrical shank insertibleAv within said bore and provided with an integral side abutment, a supporting member, and a clamping screw having a head coacting directly with said abutment and a threaded portion coacting with said member to detachably fasten both said tool and said block to said member.

3. A tool attachment, comprising, a positioning block having a hole therein, a tool having a shank insertible Within said hole and provided with an abutment, and a clamping screw coacting with y said block adjacent to said hole, said screw having an integral head cooperable directly with said abutment and said head being provided with a cut-out positionable adjacent to the tool shank upon rotation of said screw so as to permit removal of said tool without removing said screw.

4. `A tool attachment, comprising, a positioning block having a hole therein, a reaction plate coacting with said positioning block, a tool having 5 a shank insertible within said hole in contact with' said plate and provided with an' abutment,

a supporting member, and clamping means coacting directly with said abutment for detachably fastening said tool, block, and plate directly to said member.

5. A tool attachment, comprising, a positioning block having a bore, a reaction plate coacting with said block and projecting beyond said bore, a tool having a cylindrical shank insertible within said bore against said plate and provided Vwith an integral side abutment, a supporting member coacting with said plate, and a clamping screw coacting directly with said abutment and having a threaded portion coacting with said member for detachably fastening said tool, block, and plate toy said member.

6. A tool attachment, comprising, a positioning block having a hole therein, a supporting member for said block, a dowel pin for preventing displacement of said block relative to said supporting member, a tool having a shank insertible within said hole and provided with an abutment, and clamping means coacting directly with said abutment for detachably fastening said tool and said block directly to said member and for preventing rotation of said tool.

7. A tool attachment, comprising, a positioning block having a bore, a supporting member for said block, a dowel coacting with said block and with said member to prevent displacement of said block, a tool having a cylindrical shank insertible within. said bore and provided with a recess forming an abutment disposed within the wall of said bore, and a clamping screw having a head coacting with said abutment and a threaded portion coacting with said member for detachably fastening said tool and said block to said member while preventing rotation of said tool about its own axis.

8. A tool attachment, comprising, a positioning block having a bore, a tool having a cylindrical shank insertible within said bore and provided with a cut-out forming an integral abutment,'and a clamping screw having a cylindrical 50 head cooperable'with said abutment to lock said tool within said bore and to prevent rotation of said tool about its ovm axis, said screw head having a recess registrable with the wall of said bore to permit endwise removal of said tool from said block.

9. A tool attachment comprising, a positioning block having a bore, a reaction plate coacting with said block and spanning an end of said bore, a supporting member for said block and plate, a dowel for positioning said block and said plate relative to said member, a tool having a cylindrical shank insertible within said bore against said plate and provided with an abutment, and a single clamping screw having a head coacting with said abutment and a threaded portion coacting with said member for detachably fastening said tool, block, and plate to said member, and for positively preventing rotation of said tool about its own axis.

10. A tool attachment, comprising, a positioning block having a bore extending therethru, a

reaction plate coacting with said block and closing one end of said bore, a supporting member for said block and plate coacting only with said plate.' a tool having a shank snugly ttingsaid bore and provided with an abutment sed within the conilnes ot said bore, `and a, \gle clamping screw extending parallel to th`e axis 5 of said tool and having a cylindrical head coactinz with said abutment and a threaded portion coaotinz with said member to detachably fasten.

said tool, block, and plate to said member, said screw head normally preventing rotation of said tool about its own axis and being provided with bore.

HUGH M. HGDGE. 

